A Round Rock teenager died and five others suffered injuries early Saturday after a one-vehicle rollover in Parmer County, authorities said.

About 4:20 a.m., Rachquel Mosley, 34, was westbound on U.S. Highway 70, a few miles west of Farm-to-Market 1731, when she began falling asleep, Department of Public Safety troopers said. Mosley, of Round Rock, drove off the roadway into the center median and tried to get back in the west lanes, when the 2004 Chevy Trailblazer began to side-skid, DPS said.

The SUV rolled over several times before coming to a stop on its top in the center median, troopers said.

Jordan Kristofer Simms, 14, was ejected from the SUV and died at the scene, authorities said.

Mosley, Pam Williams, 40, of Round Rock, and three other children were all taken to the Muleshoe Medical Center, authorities said. Mosley was treated and released, and the other four were in stable condition Saturday evening, troopers said.

Troopers said everyone but Simms wore a seat belt at the time of the accident.